#!/bin/sh
#
# The ‘multicd’ package was initially written by Heiko Schlittermann
# <heiko@lotte.sax.de> based on builtin access methods written by Ian
# Jackson <ijackson@chiark.greenend.org.uk>.  The final packaging as well as
# cleanups were made by Martin Schulze <joey@infodrom.north.de> who also
# put this package together for the slink release (Debian GNU/Linux
# 2.1).

# Copyright © 1995-1998 Ian Jackson <ijackson@chiark.greenend.org.uk>
# Copyright © 1998 Heiko Schlittermann <hs@schlittermann.de>
#
# This is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.

set -e
vardir="$1"
method=$2
option=$3

test -d "$vardir/methods/$method" || mkdir "$vardir/methods/$method"
cd "$vardir/methods/$method"
tp=/tmp/ddm$$

iarch=`dpkg --print-architecture`
dist=stable

xit=1
trap '
	rm -f $tp.?
	if [ -n "$umount" ]
	then
		umount "$umount" >/dev/null 2>&1
	fi
	exit $xit
' 0

if ls -d "$tp.?" >/dev/null 2>&1
then
	rm $tp.?
fi

#debug() { echo "DEBUG: $@"; }
debug() { true; }
ismulti() { debug $1 $2; test -e "$1/.disk/info" || test -e "$1$2/.disk/info"; }

# 1/ mountpoint
# 2/ hierarchy
getdisklabel () {
    debug "$1" "$2"
    if [ -f $1/.disk/info ]
    then
	echo -n `head -1 "$1/.disk/info"`
    else
        if [ -f $1$2/.disk/info ]
	then
	    echo -n `head -1 "$1$2/.disk/info"`
	else
            echo -n 'Non-Debian disc'
	fi
    fi
}

yesno () {
	while true
	do
		echo -n "$2 [$1]  "
		read response
		if [ -z "$response" ]
		then
			response="$1"
		fi
		case "$response" in
		[Nn]*)	yesno=no ; return ;;
		[Yy]*)	yesno=yes ; return ;;
		esac
	done
}

getblockdev () {
	mountpoint="$vardir/methods/mnt"
	if [ -z "$defaultdevice" ]
	then
		defaultdevice="$newdefaultdevice"
	elif [ "$defaultdevice" != "$newdefaultdevice" ]
	then
		echo \
	"Last time you specified installation from $defaultdevice."
	fi
	promptstring="$1"
	while [ -z "$blockdevice" ]
	do
		echo -n "$promptstring [$defaultdevice]:  "
		read response
		if [ -z "$response" ]
		then
			response="$defaultdevice"
		fi
		if [ ! -b "$response" ]
		then
			echo "$response is not a block device - will try as loopback.";
			loop=",loop"
		fi
		tryblockdevice="$response"
		if [ $option = multi_cd ]
		then
			fstype=iso9660
		elif [ $option = harddisk2 ]
		then
			blockbase="`echo \"$tryblockdevice\" | sed -e 's/[0-9]\{1,\}$//'`"
			set +e
			printf 'p\nq\n' | fdisk "$blockbase" 2>/dev/null >$tp.f
			set -e
			proposeddevice="$tryblockdevice" perl -ne '
next unless /^ *Device +Boot +Begin +Start +End +Blocks +Id +System *$/i .. !/\S/;
next unless s:^/\S+::p && ${^MATCH} eq $ENV{proposeddevice};
next unless s/^ +(\* +)?\d+ +\d+ +\d+ +\d+\+? +//;
next unless m/^([0-9a-f]{1,2}) /i;
%types= ( "1","msdos", "4","msdos", "6","msdos", "7","hpfs", "80","minix",
          "81","minix", "83","ext2" );
print $types{$1}; exit(0);	' <$tp.f >$tp.m
			defaultfstype="`cat $tp.m`"
			if [ -n "$defaultfstype" ]
			then
				cat <<END
The partition table for $blockbase claims that $tryblockdevice
contains filesystem type $defaultfstype.
END
				if ! grep "	$defaultfstype$" /proc/filesystems >/dev/null
				then
					echo \
	"Your kernel does not appear to support that filesystem type."
					defaultfstype=""
				fi
			fi
			echo -n "Supported filesystems: "
			sed -e 's/^.*	/ /' /proc/filesystems | tr '\n' ' '
			echo -n "
Enter filesystem type (for $tryblockdevice) [$defaultfstype]:  "
			read fstype
			if [ -z "$fstype" ]
			then
				fstype="$defaultfstype"
			fi
		fi
		umount="$mountpoint"
		if mount -rt "$fstype" -o nosuid,nodev$loop "$tryblockdevice" "$mountpoint"
		then
			echo
			blockdevice="$tryblockdevice"
		else
			umount=""
			echo \
	"Unable to mount $tryblockdevice on $mountpoint, type $fstype."
		fi
	done
}

outputparam () {
	echo "$2" | sed -e "s/'/'\\\\''/; s/^/$1='/; s/$/'/" >&3
}

## MAIN
intrkey="`stty -a | sed -n 's/.*intr = \([^;]*\);.*/\1/p'`"
echo "
If you make a mistake, use the interrupt key ($intrkey) to abort.
"

# State variables, “best first”
#  {main,ctb,nf,lcl}_{packages,binary}
#   Empty before we've found them or if they're not available,
#   set to the relevant bit under mountpoint otherwise.
#  hierbase
#   A directory containing a Debian FTP site mirror tree.
#  mountpoint
#   The mountpoint for the filesystem containing the stuff
#   empty or unset if we don't know yet, or if we haven't mounted anything;
#   may also be empty if ‘directory’ was set.
#  blockdevice
#   The actual block device to mount.
#  fstype
#   The filesystem type to use.
#  defaultdevice
#   The default block device to mount.

p_usedevel=no
if [ -f shvar.$option ]
then
	. ./shvar.$option
	defaultdevice="$p_blockdev"
	defaultnfsserver="$p_nfsserver"
	defaultnfsrempath="$p_nfsrempath"
	usedevel="$p_usedevel"
fi

if [ $option = multi_cd ]
then
	mount >$tp.m
	sed -n 's/ ([^)]*)$//; s/^[^ ]* on //; s/ type iso9660$//p' <$tp.m >$tp.l
	ncdroms=`wc -l <$tp.l`
	if [ $ncdroms -gt 1 ]
	then
		response=""
		while [ -z "$response" ]
		do
			echo \
	'Several CD-ROMs (or other ISO9660 filesystems) are mounted:'
			egrep 'type iso9660 \([^)]*\)$' <$tp.m | nl
			echo -n \
	"Is it any of these ?  Type a number, or 'n' for none.  "
			read response
			response="`echo \"$response\" | sed -e 's/[ 	]*$//'`"
			if expr "$response" : '[0-9][0-9]*$' >/dev/null && \
			   [ $response -ge 1 -a $response -le $ncdroms ]
			then
				mountpoint="`sed -n $response'p' <$tp.l`"
				echo
			elif expr "$response" : '[Nn]' >/dev/null
			then
				mountpoint=""
			else
				response=""
			fi
		done
	elif [ $ncdroms = 1 ]
	then
		mountpoint="`cat $tp.l`"
		perl -ne 'print if s/ type iso9660 \([^)]*\)$// && s/ on .*$//;' \
			<$tp.m >$tp.d
		blockdevice="`cat $tp.d`"
		yesno yes \
	"I see a CD-ROM: $blockdevice, mounted on $mountpoint.  Is it the right one ?"
		if [ $yesno = no ]
		then
			echo 'Unmounting it ...'
			umount="$mountpoint"
			while true
			do
				echo -n \
	'Please insert the right disc, and hit return:  '
				read response
				if mount -rt iso9660 -o nosuid,nodev \
					"$blockdevice" "$mountpoint"
				then
					echo
					break
				fi
			done
		fi
	fi
	if [ -z "$mountpoint" ]
	then
		if [ -b /dev/cdrom ]
		then
			echo \
	'I see that /dev/cdrom exists and is a block device.'
			newdefaultdevice=/dev/cdrom
		fi
		getblockdev 'Insert the CD-ROM and enter the block device name'
	fi
fi

if [ $option = multi_nfs ]
then
	mountpoint="$vardir/methods/mnt"
	while [ -z "$nfsserver" ]
	do
		echo -n \
"What is the name of the NFS server ? [$defaultnfsserver]  "
		read response
		if [ -z "$response" -a -n "$defaultnfsserver" ]
		then
			response="$defaultnfsserver"
		fi
		if [ -z "$response" ]; then continue; fi
		if [ -x "`which rpcinfo`" ]
		then
			if rpcinfo -u "$response" mountd >/dev/null
			then
				nfsserver="$response"
			else
				echo "$response appears not to be an NFS server."
			fi
		elif [ -x "`which ping`" ]
		then
			if ping -q -c 1 "$response" | grep -q ', 1 packets received'
			then
				nfsserver="$response"
			else
				echo "$response appears to be down or nonexistent."
			fi
		else
			echo \
"(I can't check that now because there is no rpcinfo or ping.)"
			nfsserver="$response"
		fi
	done
	while [ -z "$nfsrempath" ]
	do
		echo -n "
What is the pathname on the NFS server of the filesystem with
the Debian files ? [$defaultnfsrempath]  "
		read response
		if [ -z "$response" -a -n "$defaultnfsrempath" ]
		then
			response="$defaultnfsrempath"
		else
			response="`echo \"$response\" | sed -e 's:/$::; s:^/*:/:'`"
		fi
		umount="$mountpoint"
		if mount -rt nfs -o nosuid,nodev "$nfsserver:$response" "$mountpoint"
		then
			echo
			nfsrempath="$response"
		else
			umount=""
			echo \
"Unable to mount NFS filesystem $nfsserver:$response."
		fi
	done
	nfs="$nfsserver:$nfsrempath"
fi

if [ $option = harddisk2 ]
then
	set +e
	printf 'p\nq\n' | fdisk /dev/hda 2>/dev/null >$tp.f
	if [ $? != 0 ]
	then
		printf 'p\nq\n' | fdisk /dev/sda 2>/dev/null >$tp.f
	fi
	set -e
	perl -ne '
next unless /^ *Device +Boot +Begin +Start +End +Blocks +Id +System *$/i .. !/\S/;
next unless / [146] +DOS \d+-bit \S+$/;
next unless m:^/\S+:p;
print ${^MATCH};		' <$tp.f >$tp.d
	newdefaultdevice="`cat $tp.d`"
	echo "
I need to know which disk partition contains the distribution files;
disk partitions are specified by the block device name in Linux."
	if [ -n "$newdefaultdevice" ]
	then
		echo \
"By the way, $newdefaultdevice looks like a DOS partition."
	fi
	getblockdev "Enter the partition's block device name"
fi

if [ -n "$mountpoint" ]
then
	# We must have $mountpoint
	if [ $option = multi_cd ]
	then
		echo \
'All directory names should be entered relative to the root of the CD-ROM.
'
	elif [ $option = multi_nfs ]
	then
		echo \
"All directory names should be entered relative to the root of the NFS
filesystem, ie relative to $nfsrempath on the server.
"
	else
		echo \
"All directory names should be entered relative to the root of the
$fstype filesystem on $blockdevice.
"
	fi
fi

# now try to get the users idea where the debian
# hierarchy start below the mointpoint

debug "mountpoint: $mountpoint"
while true
do
	if ismulti "${mountpoint}" "${hierbase}"; then
		multi=yes
	fi

	if [ $option = multi_cd ]
	then
		echo \
"I would like to know where on the CD-ROM the top level of the Debian
distribution is - this will usually contain the 'dists' directory.

If the CD-ROM is badly organized and doesn't have a straightforward copy of
the distribution you may answer 'none' and we'll go through the parts
I need individually."
	else
		echo \
"In order to make it easy for me to find the relevant files I'd ideally
like to install from a straightforward copy of the Debian distribution.
To use this I'll need to know where the top level of that copy of the
distribution is - this directory usually contains the Packages-Master file.

If you do not have a straightforward copy of the distribution available
just answer 'none' and we'll go through the parts I need individually."
	fi

	defhierbase=none
	if [ -n "$p_hierbase" ]; then
		if [ -d "$mountpoint/$p_hierbase/dists/$dist/main/binary-$iarch" \
			-o -n "$multi" ]; then
			echo "Last time you said '$p_hierbase', and that looks plausible."
			defhierbase="$p_hierbase"
		else
			echo "
Last time you said '$p_hierbase', but that doesn't look plausible,
since '$p_hierbase/dists/$dist/main/binary-$iarch' doesn't seem to exist.
And I can't get the impression that you're using a multi-CD  set."
		fi
	fi

	# at this point defhierbase is set if it looks plausible
	# if ‘none’ was entered, we assume a CD with a debian/ directory

	if [ none = "$defhierbase" -a -d "$mountpoint/debian/dists/$dist/main/binary-$iarch" ]
	then
		echo "'/debian' exists and looks plausible, so that's the default."
		defhierbase=/debian
	fi

	echo -n "Distribution top level ? [$defhierbase]  "
	read response
	if [ -z "$response" ]; then response="$defhierbase"; fi
	if [ none = "$response" ]; then
		hierbase=""
		break
	elif ismulti "$mountpoint" "$response" && [ -z "$multi" ]; then
		multi=yes
	fi

	if ! [ -d "$mountpoint/$response/dists/$dist/main/binary-$iarch" \
			-o -n "$multi" ]; then
		echo \
"Neither $response/dists/$dist/main/binary-$iarch does not exist,
nor are you using a multi-CD set"
		break
	fi

	hierbase="`echo \"$response\" | sed -e 's:/$::; s:^/*:/:; s:/\+:/:g;'`"
	debug "hierbase: [$hierbase]"

	if [ -n "$multi" ]; then
		disklabel=`getdisklabel "$mountpoint" "/$response"`
		echo "Ok, this is disc"
		echo "    $disklabel"
		#echo "Updating multi CD contents file cache ..."
		#multi_contentsfile="${mountpoint}/${response}/.disk/contents.gz"
		#zcat "$multi_contentsfile" > disk-contents.$option
	fi

	break;
done

distribution=$dist
if [ -n "$hierbase" ]
then
	if [ -d "$mountpoint/$hierbase/dists/unstable/binary-$iarch" ]
	then
		echo \
'
Both a stable released distribution and a work-in-progress
development tree are available for installation.  Would you like to
use the unreleased development tree (this is only recommended for
experts who like to live dangerously and want to help with testing) ?'
		yesno "$p_usedevel" 'Use unreleased development distribution ?'
		usedevel="$yesno"
		if [ "$usedevel" = yes ]
		then
			distribution=development
		fi
	else
		usedevel=no
	fi
	echo
fi

case "$hierbase" in
/* )	;;
'' )	;;
* )	hierbase="/$hierbase" ;;
esac

check_binary () {
	# args: area-in-messages directory
	debug "check_binary($@)"

	if [ ! -d "${mountpoint}$2" -a -z "$multi" ]
	then
		echo "'$2' does not exist."
		return
	fi

# In this special case it is ok for a sub-distribution to not contain any
# .deb files.  Each CD should contain all Packages.cd files but doesn't
# need to contain the .deb files.
#
#  	if ! { find -L "$mountpoint$2" -name '*.deb' -print \
#  		| head -1 | grep . ; } >/dev/null 2>&1 && [ -z "$multi" ];
#  	then
#  		echo "'$2' does not contain any *.deb packages."
#  		return
#  	fi

	this_binary="$2"
	echo -n "Using '$this_binary' as $1 binary directory"

	if [ -n "$multi" ]; then
		this_disk=`getdisklabel ${mountpoint} "/$hierbase"`
		echo " from disc"
		echo "    '$this_disk'"
	else
		echo ""
	fi
}

find_area () {
	# args: area-in-messages area-in-vars subdirectory-in-hier
	#       last-time-binary last-time-packages
	debug "find_area($@)"
	this_binary=''
	this_packages=''
	this_disk=''
	if [ -n "$hierbase" ]
	then
		check_binary $1 `echo "$hierbase/dists/$3/$1/binary-$iarch" | sed 's:/\+:/:g'`
		debug "THIS_BINARY $this_binary"
	fi
	if [ $option = multi_cd -a $2 = nf -a -z "$this_binary" ]
	then
		echo "
Note: most CD-ROM distributions of Debian do not include programs
available in the 'non-free' directory of the distribution site.
This is because these programs have copyrights that prevent
distribution for profit on a CD-ROM - ie they are not free software.
If you wish to install these programs you'll have to get them from an
alternative source."
	fi
	while [ -z "$this_binary" ]
	do
		defaultbinary="$4"
		echo "
Which directory contains the *.deb packages from the $1 distribution
area (this directory is named '$3/binary' on the distribution site) ?
Say 'none' if this area is not available."
		if [ $2 != main -a -z "$defaultbinary" ]
		then
			defaultbinary=none
		fi
		echo -n \
"Enter _$1_ binary directory. [$4]
 ?  "
		read response
		if [ -z "$response" -a -n "$defaultbinary" ]
		then
			response="$defaultbinary"
		fi
		if [ none = "$response" ]
		then
			break
		fi
		case "$response" in
		'' | none)	continue		;;
		esac
		check_binary $1 "`echo \"$response\" | sed -e 's:/$::; s:^/*:/:'`"
	done
	if [ -n "$this_binary" ]
	then
		if [ "$multi" = "yes" ]; then
			for f in Packages.cd.gz packages.cd.gz Packages.cd packages.cd
			do
				if [ -f "$mountpoint/$this_binary/$f" ]
				then
					this_packages="$this_binary/$f"
					echo "Using '$this_packages' for $1."
					break
				fi
			done
		else
			if [ -f "${mountpoint}${hierbase}/.disk/packages/$1/Packages.gz" ]; then
				this_packages=`echo "${hierbase}/.disk/packages/$1/Packages.gz"|sed 's:/\+:/:g'`
				echo "Using '${this_packages}' for $1."
			fi
		fi
		while [ -z "$this_packages" ]
		do
			echo -n "
I can't find the $1 'Packages.cd' file.  The information in the
'Packages.cd' file is important for package selection during new
installations, and is very useful for upgrades.

If you overlooked it when downloading you should do get it now and
return to this installation procedure when you have done so: you will
find one Packages.cd file and one Packages.cd.gz file -- either will do --
in the 'binary' subdirectory of each area on the FTP sites and
CD-ROMs.  Alternatively (and this will be rather slow) I can scan the
packages in the distribution area - say 'scan' if you want me to do so.

You need a separate Packages.cd file from each of the distribution areas
you wish to install.

Where is the _$1_ 'Packages.cd' file (if none is available, say 'none')
[$5]
 ?  "
			read response
			if [ -z "$response" -a -n "$5" ]
			then
				response="$5"
			fi
			case "$response" in
			'')		break				;;
			none)		break				;;
			scan)		this_packages=scan		;;
			/*)		this_packages="$response"	;;
			*)		this_packages="/$response"	;;
			esac
		done
	fi
	eval $2'_binary="$this_binary"'
	eval $2'_packages="$this_packages"'
	eval $2'_disk="$this_disk"'
}

find_area main main "$distribution" "$p_main_binary" "$p_main_packages"
find_area contrib ctb "$distribution" "$p_ctb_binary" "$p_ctb_packages"
find_area non-free nf "$distribution" "$p_nf_binary" "$p_nf_packages"
find_area local lcl local "$p_lcl_binary" "$p_lcl_packages"

echo -n '
Hit RETURN to continue.  '
read response

exec 3>shvar.$option.new

outputparam p_blockdev "$blockdevice"
outputparam p_fstype "$fstype"
outputparam p_mountpoint "$mountpoint"
outputparam p_nfsserver "$nfsserver"
outputparam p_nfsrempath "$nfsrempath"
outputparam p_nfs "$nfs"
outputparam p_hierbase "$hierbase"
outputparam p_usedevel "$usedevel"
outputparam p_main_packages "$main_packages"
outputparam p_main_binary "$main_binary"
outputparam p_main_disk "$main_disk"
outputparam p_ctb_packages "$ctb_packages"
outputparam p_ctb_binary "$ctb_binary"
outputparam p_ctb_disk "$ctb_disk"
outputparam p_nf_packages "$nf_packages"
outputparam p_nf_binary "$nf_binary"
outputparam p_nf_disk "$nf_disk"
outputparam p_lcl_packages "$lcl_packages"
outputparam p_lcl_binary "$lcl_binary"
outputparam p_multi "$multi"
outputparam p_multi_contentsfile "$multi_contentsfile"

mv shvar.$option.new shvar.$option

xit=0
